Sliding And Locking Mechanism Of Operator Cabin Rear Window For Backhoe Loader
Field of the invention:
The present invention is directed to Backhoe loader Operator Cabin and relates specifically to new and improved Cabin rear window mechanism to slide longitudinally parallel to the roof top and locking of the window both in open and closed position.
Background of the invention:
The drive/operator cabin of backhoe loader conventionally comprises of a rear window which is a big window through which the driver/operator can view, even in its closed condition. For better visibility or for better conditioning of the cabin, the operator opens this window. During the operation the backhoe section, including its backhoe bucket performs its moves in such a large diameter that the visibility becomes a very important issue to the operator. Therefore it is preferable to have such a rear window of the operator's cabin, which is capable of being opened by sliding longitudinally parallel to the roof top of the cabin. Such Cabin rear windows are known in the prior art but they comprise of one or another type of drawbacks, namely:
i) Involve great human effort in operating and locking the rear window
of the Cabin, particularly due to long weathering and rusting of the components thereof.
ii) Window does not travel confining within internal area of the Cabin.
iii) The said window does not provide sufficient clear visibility for the operator during working Backhoe end. The present invention proposes a new and improved Cabin rear window mechanism to slide longitudinally parallel to the roof top and locking of the window both in open and closed position, which is virtually free from all the drawbacks of previously known rear windows of backhoe loaders.
Objective of the invention
The prime object of the invention is to propose a new sliding window mechanism to have minimal human effort in operating and locking the rear window of the Cabin; wherein the said sliding mechanism is hinged to the main frame at the rear end of the cabin and it is used to move the window frame fitted with the glass with respect to the main cabin frame and to convert rotational movement of the link to translation movement of the window frame. Another object of the invention is to propose a new sliding window mechanism to have window travel confining within internal area of the Cabin. Another object of the invention is to propose a new sliding window mechanism to have to achieve more/clear visibility for the operator during working Backhoe end.
Statement of the present invention:
The present invention is intended to propose a new sliding window mechanism to have minimal human effort in operating and locking the rear window of the Cabin; and to propose a new sliding window mechanism to have window travel confining within internal area of the Cabin; and to propose
a new sliding window mechanism to have to achieve more/clear visibility for the operator during working Backhoe end.
Description of the present invention: The sliding mechanism:
The mechanism is hinged to the main frame at the rear end of the cabin. It is
used (i) to move the window frame fitted with the glass with respect to the
main cabin frame, (ii) to convert rotational movement of the link to translation
movement of the window frame.
The sliding window mechanism consists of i) Links, ii) C-channel iii) Bush
bearing to slide along the channel, iv) Hinge Brackets for Bearing Bush v)
Rubber stopper vi) Gas struts vii) window frame with glass viii) Hinge
Brackets for Links ix) window frame brackets.
The window frame with the glass is fixed at the rear end of the cabin with grab
handle (ref fig 1) welded on it. Two Hinge Brackets for Bearing Bush (ref fig 2)
are fixed at each end at the bottom side of the window frame which hinges the
bush bearing (ref fig 2) and slides along the C - channel (ref fig 1). One set of
Hinge Brackets of Links are fixed above the cabin frame (ref fig 1).
One end of the two links hinged with the brackets fixed above the cabin frame
and equidistant from the center. The other end is hinged with the window
frame bracket; the window frame can rotate about this hinge point.
Two vertically opposite C - channels are equidistant from the center plane of
the Cabin are welded to Vertical pillars (ref fig 1) of the Cabin to guide the
bush bearing in vertical direction.
Two Gas struts (ref fig 1), of which cap ends are hinged with the links. The rod
end of the gas struts is hinged with the C -channel.
The bush bearing (ref fig 2) is an assembly having a pin, which is press fitted
with a steel shaft. A bronze bush is fitted with the steel shaft with capable
enough to rotate with the steel shaft is assembled with cup washers and
circlip on the other end of the pin.
Detailed description of Operation of sliding mechanism:
The machine operator during the operation of backhoe intends to operate with
the window in open position for better visibility. To have the window in open
position, initial effort has to be applied by the operator by pulling the grab
handle towards the operator which is welded on to the window frame.
The initial force applied on the grab handle by the operator tends to move the
top end of the window frame towards the operator while the bottom end which
is held by the Hinge bracket for bearing, guides the bearing bush to move
across the C - channel. The gas struts hinged with the links with the ability of
the compressed gas pushes further the window frame hinged with the links.
The relative rotational movement achieved from the links is converted to
translation motion for the window frame which is guided inside the channel,
thus making the window move longitudinally parallel to the roof top of the
internal of the cabin. The stroke of the gas strut is controlled by a rubber
stopper fixed inside the channel thus restricting the window frame for further
travel.
Sliding window and its advantages:
During the backhoe operation the operator should have a clear visibility of
boom which has the ability to articulate about the hinged point, arm and the
bucket along with the boom can translate laterally. Window frame is one of the
structures which obstructs to the visibility during this operation. Hence to have
a clear visibility it is intended to open the window frame to the fullest.
Details description of locking for sliding window:
The lock is hinged with the window frame. It used (i) to lock the window frame
in open and close position.
The lock for sliding window consists of (i) Steel Shaft (ii) plate welded on the
shaft (iii) Boss (iv) rod welded to the boss (iv) Spring (iv) Washers (iv) Screw
(iv) Sleeve;
Refer Figure 2 & 3.
The shaft is tapped on one end of the face. A plate having a hole size of the
shaft is welded just above the shaft surface on the opposite end. A spring,
washers placed on the opposite ends of the spring is inserted in the shaft.
This arrangement is inserted in the sleeve which is welded with the bracket of
the window frame. A boss is screwed with the shaft. A rod is welded to the
boss to operate the shaft.
Detailed description of the operation of locking for sliding window:
The shaft with the spring and washer arrangement is inserted in the sleeve
which is welded on the window frame and is screwed with the b,oss.
When the window frame is in closed position, the operator applies force on
the handle which is welded on the boss. The boss, who has a positive locking
with the shaft, thus compresses the spring. The plate welded on the shaft is
then rotated with the help of the handle which rotates and gets locked with a
flange welded on the channel of the cabin frame.
When the window is in open position, the sleeve, which is welded on the bottom end of the frame, moves along and is at the top of the frame for the window in open position. At this location a bracket with a hole size of the shaft is welded on the channel act as a fool proof for locking the window frame in open position. The handle is pushed along the axis of the sleeve, the shaft which has a positive locking with the boss moves inside the hole of the bracket mounted on the channel until it is stopped by the plate welded on the shaft. The rotation of the handle fixes the plate on the shaft with the other bracket welded on the channel.
Scope of the invention:
The sliding and locking mechanism of a cabin's window, as described herein for the backhoe loader's driver-cabin, cab be applied/used at various other types of enclosures, viz. domestic, industrial or mobile cabins/enclosures. The type of suitable structural material can be selected for the construction of the frame of the proposed window herein, depending of the utility and type of the said cabin/enclosure. For example, in spite of iron, aluminum or other alloyed material can be applied for making the said frame of the said rear window. Apart from the backhoe loader, the present technology of the rear window can suitably be applicable to various types of cranes, construction equipments and vehicles therein such windows are required.

We claim:
1. Sliding and locking mechanism of operator cabin rear window for
backhoe loader, wherein the said sliding mechanism is hinged to
the main frame at the rear end of the cabin and is characterized by
its application to move the window frame fitted with the glass with
respect to the main cabin frame, and to convert rotational
movement of the link to translation movement of the window frame;
and
wherein the said locking arrangement for sliding window is hinged with the window frame and it is characterized by its application to lock the window frame in open and close position
2. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1, wherein the sliding window mechanism primarily comprises of (i) Links, (ii) C-channel (iii) Bush bearing to slide along the channel, (iv) Hinge Brackets for Bearing Bush (v) Rubber stopper (vi) Gas struts (vii) window frame with glass (viii) Hinge Brackets for Links and (ix) window frame brackets.
3. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1, wherein to characterize the sliding window mechanism, the window frame with the glass is fixed at the rear end of the cabin with grab handle welded on it; two Hinge Brackets for Bearing Bush are fixed at each end at the bottom side of the window frame which hinges the bush bearing and slides along the C-channel; one set of Hinge Brackets of Links are fixed above the cabin frame; one end of the two links hinged
with the brackets fixed above the cabin frame and equidistant from the center; the other end is hinged with the window frame bracket, the window frame can rotate about this hinge point; two vertically opposite C - channels are equidistant from the center plane of the Cabin are welded to Vertical pillars of the Cabin to guide the bush bearing in vertical direction; two Gas struts, of which cap ends are hinged with the links; the rod end of the gas struts is hinged with the C -channel; the bush bearing is an assembly having a pin, which is press fitted with a steel shaft; and a bronze bush is fitted with the steel shaft with capable enough to rotate with the steel shaft is assembled with cup washers and circlip on the other end of the pin. 4. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1, wherein to characterize the operation of the said sliding window mechanism, particularly to have the window in open position, initial effort has to be applied by the operator by pulling the grab handle towards the operator which is welded on to the window frame; wherein the initial force applied on the grab handle by the operator tends to move the top end of the window frame towards the operator while the bottom end, which is held by the Hinge bracket for bearing, guides the bearing bush to move across the C - channel, and the gas struts hinged with the links with the ability of the compressed gas pushes further the window frame hinged with the links; and wherein the relative rotational movement achieved from the links is converted to translation motion for the window frame which is guided inside the
channel, thus making the window move longitudinally parallel to the roof top of the internal of the cabin; and wherein the stroke of the gas strut is controlled by a rubber stopper fixed inside the channel thus restricting the window frame for further travel.
5. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1, wherein the locking mechanism for sliding window consists of (i) Steel Shaft (ii) plate welded on the shaft (iii) Boss (iv) rod welded to the boss (iv) Spring (iv) Washers (iv) Screw (iv) Sleeve; wherein the shaft is tapped on one end of the face; a plate having a hole size of the shaft is welded just above the shaft surface on the opposite end; a spring, washers placed on the opposite ends of the spring is inserted in the shaft; and wherein this arrangement is inserted in the sleeve, which is welded with the bracket of the window frame; and wherein a boss is screwed with the shaft and a rod is welded to the boss to operate the shaft.
6. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1, to characterize the operation of the said locking mechanism for sliding window, the shaft with the spring and washer arrangement is inserted in the sleeve which is welded on the window frame and is screwed with the boss;
and
When the window frame is in closed position, the operator applies force on the handle which is welded on the boss; the boss, which has a positive locking with the shaft, thus compresses the spring;
and the plate welded on the shaft is then rotated with the help of the handle which rotates and gets locked with a flange welded on the channel of the cabin frame; And
When the window is in open position, the sleeve, which is welded on the bottom end of the frame, moves along and is at the top of the frame for the window in open position; and wherein at. this location a bracket with a hole size of the shaft is welded on the channel act as a fool proof for locking the window frame in open position; and wherein the handle is pushed along the axis of the sleeve, the shaft which has a positive locking with the boss, moves inside the hole of the bracket mounted on the channel, until it is stopped by the plate welded on the shaft; and therefore the rotation of the handle fixes the plate on the shaft with the other bracket welded on the channel. 7. Sliding and locking mechanism of operator cabin rear window for backhoe loader, as claimed in claim 1 and substantially as herein described and illustrated in the figures of the accompanying
drawings.